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DS90LT012AQ-Q1: Failsafe biasing

Bill Ryder
Prodigy 10 points
Part Number: DS90LT012AQ-Q1

Does this part require external resistor biasing to achieve the "Full Fail-safe OPEN/SHORT or Terminated" functionality, or is failsafe performance inherent to the part just using the internal termination resistor?

  • 0
    TI__Mastermind 46797 points

    Hi Bill,

    This device is full-failsafe; meaning that it inherently is input failsafe for open/short/terminated(idle) cases without external circuitry. 

    This is achieved by having both differential thresholds <= 0V. 

    So when bus is open/terminated(idle)/shorted the differential voltage should be 0V - but the threshold is pegged typically to -30mV. So the output will be high in those cases. 

    Please let me know if there is anything else I can do to help!

    Best,

    Parker Dodson